Rails 4: accepts_nested_attributes_for / nested forms

I do not know what the protocol is if you have a rails question with
several files. Do you post all here? I have asked a question on stack
overflow buy have not found an answer yet:

I was hoping to get more eyeballs on it. If this is not correct to
link to stack overflow please let me know.

I am having trouble getting the models and new add form setup to save
data for my first solo rails project. I have worked through some
and done basic reading on rails so far so I might have made a basic
conceptual mistake. The essence appears to be that some of the related
model data is saved but not all. Any tips would be greatly appreciated.